Circuit interrupter



Filed July l0, 1918 2 Sheets-Sheet 1 INV ENTOR 02 M202; fiai 02 BY 7 j ATTORNEY WITNESSES Dec C. AALBORG CIRCUIT INTERRUPTER 2 Shets-Sheet .2

-Filed July 10, 1918 ATTORNEY WITNESSES:

' therefor.

Patented Dec. 16, 192 4.

UNITEDSTIATES' PATENT OFFICE.

PENNSYLVANIA, ASSIG-NOR TO TESTING COMPANY, A CORPORATION 01*" PENNSYL- 1 cincorr INTERRUPTER.

Application filed July 10,

To all whom it may concern:

Be it known that I, CHRISTIAN AALBORG, a citizen of the United States, and a resident of VVilkinsburg, in the-county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Circuit, Interrupters, of which the following is a specification.

My invention relates to circuit-interrupters and particularly to arc-blow-out devices One object of my invention is to provide arc-extinguishing devices for circuit-interrupters having barriers therein that are 130- sitioned to conform to the shape of the arcs that are drawn when the interrupters are opened. I

Another. object of my invention is to provide an arc-blow-out device. for a circuit-interrupter that shall have means for'removin'g the are from the contact members to prevent deterioration of the same.

Another object of my invention is to provide an arc-blow-out device that shall have means for so centering the are between the I walls of the device as to prevent injury thereto.

A further object of my invention is to provide a device of the above-indicated charactor that shall be inexpenslve to construct and efi'ective in its operation.

In practicing my invention, I provide a circuit-interrupter having main and auxiliary contact members. An are chute, comprising two side walls, is disposed around the auxiliary contact members, and radially extending barriers are disposed between the walls of the are chute. The barriers are so placed that the arc is permitted to assume its natural shape, that is, they extend downwardly from the contact members as well as upwardly and outwardly therefrom. A

' magnetizable member is attached to one of the barriers and extends to the central part of the device for the purpose of co-operat'ing with other magnetizable members that are disposed at an inner central portion of the other barriers to remove the are from the contact members. A blow-out coil is arranged to direct magnetic lines of force nor- 1119.] to the centralmagnetizable member and 1913. Serial n. 244,261.

co-operates with the magnetizable members to hold the arc in a central position with respect to the side walls of the. device to thereby prevent injury to the same.

In the accompanying drawings, Figure 1 is a sideview, partially in section and partially in elevation, of a circuit-inter-rupter embodying my invention; Fig. 2 is a side View, partially in section and partially in elevation, of a blow-out coil and the are chute shown in Fig. 1 Fig. 3 is a front elevational View of the device shown in Fig. 2; Fig. 4

is a'top plan view of the arc chute shown in Fig. 2, and Fig. 5 is a diagrammatic view of the arc chute illustrating the direction of the t are therein.

'A circuit-interrupter is mounted on a panel board 1 and comprises, in general, main stationary contact members 2, a main movable bridging member 3, an auxiliary stationary mechanism 6 is connected between the arm 9 and a point 15 on the arm 11, and the operating device 7 is connected to one leg of the toggle mechanism 6 for the purpose of setting the same and thus forcing the contactmembers into engagement.

The arc-extinguishing device 8 comprises two. side walls 16 and 17 of soapstone, asbestos'or othersuitable. insulating material and a plurality of insulating barriers 18 that are disposed between the walls 16 and 17 and radiate from a central portion in .all directions therefrom; That is, two of the barriers 18 extend downwardly and thus assume a position corresponding to the natural shape of an are that is drawn when the contact members 4 and 5 are separated. A

magnetizable member 19 of substantially heart-shape is secured to the downw rdly extending barrier 18 at the center of its inner contact member 4, a movable auxiliary conedge and, similarly, magnetizable members 20 are secured to the other barriers 18 at the central portion of the inner edges thereof.

A magnetizable member 21, having two poles 22 which are energized bycoils 23 that are connected in series with the main contact.

.members 2 and 3, is mounted on the rear 01 the panel]. and extends to such position that the poles 22 are so disposed, in relation to the inner ends of the barriers .18, that magnetic lines of force therefrom will pass engaged from the stationary contact member 4 and thus an arc will be drawn which, when the contact member 5 reaches its final position, will pass from the magnetizable memhere 20 on the barriers adjacent the contact members through the member 19, as shown by the broken line 24 in Fig. 1 of the drawings. The members 19 and 20 are so disposed that they receive the are from the contact members 1 and 5 and'thus prevent deterioration of the same. The lowermost barriers 18 extend downwardly in order that the are, which normally assumes the position shown by the broken lines 25, be dissipated in a normal direction. Of course, since the blow-out coils 23 tend to deflect the arc, thesame will advance-to the position shown by the dotted lines 26 and will thus be broken up into a plurality of series-connected arcs, the total counter electromotive force of which permits the same 'to be dissipated with a minimum disturbance.

In Fig. 5 of the drawings, the lines 27 represent the direction of the magnetic lines of force from one pole 22'of the maget 21 to the other pole of the same. That is, the

lines of torce will converge toward the magnetizable members 19' and 20 and thus the arc 28 that would normally be distorted it the magnetizable members 19* and 20 arenot provided, w ll be so neutralized that the arc will assume ie position shown by the lines 29. resultant force caused by concengnetic nes oi force iu-the J and 20 t cause the arc to be h tween th c rails 16 and 17 e from being deas other of the s" tie life of the eased.

may be permitted to 115*] directing magnetic lines tion normal tinguishing device illustrated, as various modifications may be made therein Without departing from the spirit and scope of the invention as set forth in the appended claims.

I claim as my invention:

1. An arc-blow-out device for a'c-ircuit-interrupter comprising side walls, radial barriers disposed between the Walls, and mag netic means disposed at the center of the device and on the barriers for directing the are away fromthe walls.

2'. In a circuit-inten-upter, the combination with contact members, of an arc-chute comprisinginsulated side walls, radial arcsplitting means extending from the contact members in all directions, and magnetic means disposed adjacent the contact members and on the arc-splitting means for removing the are from the contact members and for directing the same away from the side walls.

3. In a circuit-interrupter, the combination with contact members, or an arc-chute comprising insulated side Walls, radial arcsplitting means extending from the contact members in all directions, and means disposed adjacent the contact members and at the center of the inner end of each arc-s litting means for removing the are from t e contact members.

l. An arc-bloW-out device comprising two insulated side walls, insulated barriers radiating from a central portion of the device in all directions for splitting the are, a magnetizable member disposed adjacent the inner ends of the barriers in the centrel portion of the device, and electro-magnetic means for deflecting the are.

5. An arc-bloW-out-device comprising two insulated side walls, insulated barriers radiating from. a central portion of the device, a inagnctizable member mounted at the center oi one barrier and eirtending into the acne tral portion of the c "ice, and means for directo the face of ti 1 1 member.

lid

new.

bers disposed at the center of the inner ends of the barriers in :1 plane with the magnetizable member, and electromagnetic means for forcing the are eutwardly. 1

7. A11 erc-blow-oln device comprising two insulated side Walls, insulated barriers disposed. between tl'zewalls and radiating in all directions iT'em ecenfiml portion of the vice, and a, nmgnetizable member mounted en one ef the barriers em? extending into che eentral portion of the device.

f In testimony whereof, 3: have hereunto subscribed my name this 26th day of June, 1918.

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